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Pre empting that my 3 1/2 might need a rebore or at least new rings, I will find out during the winter months.

Although it starts / runs / ticks over just fine, there has to be some reason for it's lack of compression.

It has started to burn a little oil on the front pot so could be bores / rings.

I gather that both pistons and rings are verging on "unobtanium", and some people bore them out to 375cc but the pistons / rinigs for that are hard / impossible to get hold of.

Just interested to know how easy it is to get hold of pistons / rings and where I might have a chance of getting them.

Of course it could be the valves - I'l find out when I take it apart in the winter, in the meantime I'll keep riding it.

For what it's worth, it looks like this company https://www.coxandturner.co.uk/piston-rings/ can probably make / supply piston rings, but not pistons.

Might be helpful if someone is looking for a set of rings.

No going to be taking mine down until the winter months so will not know exactly what I need until then.

King of pistons in Italy?

I took a look at Kings of Pistons, looks like they do "printed" pistons for 350's - only £850 or therabouts each !!!

Guess they are 3D printed.

Not really going to know what I need until I take the top end off over winter.

Hi Andy

I took a look at Kings of Pistons, looks like they do "printed" pistons for 350's - only £850 or therabouts each !!!

Guess they are 3D printed.

In Italian "stampa" means to press or as we would say forge, hence "stampati" meaning forged these are forged pistons hence the expense.
I think they do more typical cast pistons. Right next to these are "a campione" which refers to them being of standard type.
Here i think you must discuss your requirement with them - they conversed with me via Whatsapp - I have ordered from here
250 pistons and they are most helpful and the pistons are perfect.
Prezzo coppia - its price for a pair!

Mark